Reptiliomorpha
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Reptiliomorpha is a clade containing the amniotes and those tetrapods that share a more recent common ancestor with amniotes than with living amphibians. It was defined by Michel Laurin and Vallin and
Limnoscelis, a carnivorous diadectomorph
Gephyrostegus, a small terrestrial tetrapod
Discosauriscus, a neotenic seymouriamorph
Archeria, an aquatic embolomere
Bird
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Birds are a group of warm-blooded vertebrate animals constituting the class Aves, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chamb
Reptiliomorpha
…of the reptiliomorphs, the amniotes, continued to flourish and evolve into a staggering diversity of tetrapods including mammals, reptiles, and birds. List of reptiliomorphs…
Kleiber Flug
Archaeopteryx is often considered the oldest known true bird.
Anchiornis huxleyi is an important source of information on the early evolution of birds in the Late Jurassic period.
Confuciusornis sanctus, a Cretaceous bird from China that lived 125 million years ago, is the oldest known bird to have a beak.